Can I share my internet connection???

Hello,

I wonder if I can share my internet connection trough my router. I have
the following setup:

one PC with wireless adapter that has internet connection trough it and a
free wired adapter that is not used right now.

Linksys WRT542 V1 router

second PC with wireless adapter that needs the internet connection from PC1

Can I use my router to share the internet connection of PC1 trough Wi-Fi.?

My both configurations are old and I'm using whatever I have. The last
thing I would want is to give money for anithing.

I need this because the PC2 is too far from the router I'm getting the signal
to power internet on PC1.

Is there any easy way to do the sharing or I need to find myself more powerfull
antennas for PC2?

Thanks in advance :)